#ifndef __stacktrace_h__
#define __stacktrace_h__

// stacktrace.h (c) 2008, Timo Bingmann from http://idlebox.net/
// published under the WTFPL v2.0

#include <iostream>
#include <cstdlib>
#include <execinfo.h>
#include <cxxabi.h>

#define MAX_FRAME_SIZE 63

/** Print a demangled stack backtrace of the caller function to FILE* out. */
static inline void print_stacktrace(std::ostream& out = std::cerr)
{
    out <<  "\nSTACK TRACE:\n" ;

    // storage array for stack trace address data
    void* addrlist[MAX_FRAME_SIZE+1];

    // retrieve current stack addresses
    int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void*));

    if (addrlen == 0) {
      out << "  <empty, possibly corrupt>\n" ;
      return;
    }

    // resolve addresses into strings containing "filename(function+address)",
    // this array must be free()-ed
    char** symbollist = backtrace_symbols(addrlist, addrlen);

    // allocate string which will be filled with the demangled function name
    size_t funcnamesize = 256;
    char* funcname = (char*)malloc(funcnamesize);

    // iterate over the returned symbol lines. skip the first, it is the
    // address of this function.
    for (int i = 1; i < addrlen; i++)
    {
      char *begin_name = 0, *begin_offset = 0, *end_offset = 0;

      // find parentheses and +address offset surrounding the mangled name:
      // ./module(function+0x15c) [0x8048a6d]
      for (char *p = symbollist[i]; *p; ++p)
      {
          if (*p == '(')
        begin_name = p;
          else if (*p == '+')
        begin_offset = p;
          else if (*p == ')' && begin_offset) {
        end_offset = p;
        break;
          }
      }

        if (begin_name && begin_offset && end_offset
            && begin_name < begin_offset)
        {
            *begin_name++ = '\0';
            *begin_offset++ = '\0';
            *end_offset = '\0';

            // mangled name is now in [begin_name, begin_offset) and caller
            // offset in [begin_offset, end_offset). now apply
            // __cxa_demangle():

            int status;
            char* ret = abi::__cxa_demangle(begin_name,
                                            funcname, &funcnamesize, &status);
            if (status == 0) {
                funcname = ret; // use possibly realloc()-ed string
                out << "  " << symbollist[i] << " :  " << funcname << "+" << begin_offset << "\n" ;
            }
            else {
                // demangling failed. Output function name as a C function with
                // no arguments.
                out << "  " << symbollist[i] << " :  " << begin_name << "+" << begin_offset << "\n" ;
            }
        }
        else
        {
            // couldn't parse the line? print the whole line.
            out << "  " << symbollist[i] << "\n";
        }
    }

    free(funcname);
    free(symbollist);
}

#endif // __stacktrace_h__
